Communication method and communication apparatus

Abstract

A communication method including receiving a common channel signal, transmitting information indicating a reception state based on data included in the received signal, determining whether or not the data included in the received signal is acquirable, measuring fading speed based on the received signal in the case where the data is determined not to be acquirable, estimating whether or not the data is determined to be acquirable by re-determination based on the measurement result, and adding specified signals before and after the information indicating the reception state when the estimating results in a determination that the data is acquirable by re-determination.

The invention claimed is: 
     
       1. A communication method comprising:
 receiving a common channel signal; 
 transmitting information indicating a reception state based on data included in the received common channel signal; 
 determining whether or not the data included in the received common channel signal is acquirable; 
 measuring fading speed based on the received common channel signal in the case where the data is determined not to be acquirable; 
 estimating whether or not the data is determined to be acquirable by redetermination based on the measurement result; and 
 adding specified signals before and after the information indicating the reception state when the estimating determines that the data is acquirable by re-determination. 
 
     
     
       2. The communication method according to  claim 1 , wherein the estimating determines that the data is acquirable when the measurement result indicates that the fading speed is more than a threshold value. 
     
     
       3. The communication method according to  claim 1 , wherein not subsequently adding the specified signals in the case where the data is determined not to be acquirable by re-determination after estimating that the data is determined to be acquirable by re-determination. 
     
     
       4. The communication method according to  claim 1 , wherein determining whether or not the data is acquirable based on an acquisition state of control information used to acquire the data. 
     
     
       5. The communication method according to  claim 4 , wherein determining whether or not the data is acquirable based on an error detection result corresponding to the decoded control information. 
     
     
       6. The communication method according to  claim 1 , wherein not adding the specified signals to the information indicating the reception state when the measurement result being estimated that the data is determined not to be acquirable is obtained. 
     
     
       7. A communication apparatus comprising:
 a receiver configured to receive a common channel signal; 
 a transmitter configured to transmit information indicating a reception state based on data included in the received common channel signal; and 
 a processor configured to 
 determine whether or not the data included in the received common channel signal is acquirable, 
 measure fading speed based on the received common channel signal in the case where the data is determined not to be acquirable, 
 estimate whether or not the data is determined to be acquirable by re-determination based on the measurement result, and 
 add, in the case where the data is determined to be not acquirable, specified signals before and after the information indicating the reception state based on the fading measurement. 
 
     
     
       8. The communication apparatus of  claim 7 , wherein the specified signals are added based on the estimate indicating the data is acquirable by re-determination. 
     
     
       9. A device providing information indicating a reception state based on data included in a received common channel signal, comprising:
 a memory; and 
 a processor configured to, by executing a procedure in the memory, 
 determine whether or not the data included in the received common channel signal is acquirable, 
 measure fading speed based on the received common channel signal in the case where the data is determined not to be acquirable, 
 estimate whether or not the data is determined to be acquirable by re-determination based on the measurement result, and 
 add, in the case where the data is determined to be not acquirable, add specified signals before and after the information indicating the reception state based on the fading measurement. 
 
     
     
       10. The device of  claim 9 , wherein the specified signals are added based on the estimate indicating the data is acquirable by re-determination.